笔记

安卓组件

编号	组件	描述
1	Fragments	表示Activity中的用户界面的一部分。
2	Views	在屏幕上绘制的UI元素，包括按钮，列表形式等
3	Layouts	查看控制屏幕格式和视图外观的层次结构。
4	Intents	消息连接组件在一起。
5	Resources	外部元素，如字符串，常量和可绘制图片。
6	Manifest	应用程序的配置文件。

manifest详解

Activity启动模式(launchMode)

android:launchMode="singleTop"

关于字体大小

• 使用sp作为字体大小单位,会随着系统的字体大小改变
• 而dp作为单位则不会.

设置颜色的几种方式

 basicTv.setTextColor(Color.GREEN)

basicTv.setTextColor(0xff00ff)
basicTv.setTextColor(Color.rgb(22,33,55))
basicTv.setTextColor(Color.argb(0,200,0,0))
basicTv.setTextColor(Color.parseColor("#00ff00"))

安卓打包修改名字

关于打包的定义

Make Project:- Means you create a real aplication which is working on device and has a executable file like apk.

Make Module:- means you create a library project for you aplication which is executed with that project and has no executable file like apk but has jar files which work as a library.

Build apk: when you normally run your application an apk file is generated locally which is like a zipfile and is easily unzipable no security is implemented and you can get the code from that apk file. It is used basically for local testing.

Signed apk: it is that apk you can create with a password and security and it is not easily unzipable and is used for production.

定义打包名称

    // 打包 用来打包修改名字的 跟defaultConfig是同一级的
    applicationVariants.all { variant ->
        variant.outputs.all { output -> // 这里和2.0的不一样 2.0是each 3.0是all
            def outputFile = output.outputFile
            def fileName;
            if (outputFile != null && outputFile.name.endsWith('.apk')) {
                if (variant.buildType.name.equals('release')) {
                    fileName = "[项目名]${releaseTime()}_${defaultConfig.versionName}_release.apk"
                } else if (variant.buildType.name.equals('debug')) {
                    fileName = "[项目名]${releaseTime()}_${defaultConfig.versionName}_debug.apk"
                }
                outputFileName = fileName // 这里和2.0不一样
            }
        }
    }

定义一个时间

//打包 打包版本需要的当前时间名字 跟 Android 是同一级的
def releaseTime() {
    //注意时间不对 请注意时区问题 时区在小时分钟的时候不一样
    return new Date().format("yyyy-MM-dd-HH-mm", TimeZone.getTimeZone("Asia/Shanghai"))
}

在build.gradle.kts引入function.gradle中方法

import groovy.lang.Closure
apply(from="functions.gradle")
val buildVersionName: Closure<Any> by ext
buildVersionName()

获取所有的provider

@Composable

fun ThirdScreen() {
  val ctx = LocalContext.current as ComponentActivity
  Button(onClick = {
    for (pack in ctx.getPackageManager().getInstalledPackages(PackageManager.GET_PROVIDERS)) {
      val providers = pack.providers
      if (providers != null) {
        for (provider in providers) {
          if (provider.toString().contains("neofileprovider")){
            XLog.d(  "provider: " + provider.authority)
            XLog.d(ctx.getPackageName() )
          }

        }
      }
    }
  }) {
    Text(text = "provide")
  }
}

provider冲突解决办法

添加一个MiniProvider继承FileProvider,authority都要${applicationId}..multi_image.provider这种,然后使用requireActivity().getPackageName()+".multi_image.provider",

FileProvider.getUriForFile(  requireActivity(),  requireActivity().getPackageName()+".multi_image.provider",  mTmpFile)

使用fragmentutils

  FragmentUtils.add(supportFragmentManager, frags, R.id.lib_frag, 0)
    val callback = object : OnBackPressedCallback(
      true // default to enabled
    ) {
      override fun handleOnBackPressed() {
        XLog.enableStackTrace(2).d( FragmentUtils.getTopShow(supportFragmentManager))
        if (FragmentUtils.getTopShow(supportFragmentManager) is LiblistFragment){
          finish()
        }else{
          FragmentUtils.replace(supportFragmentManager,LiblistFragment(),R.id.lib_frag)
        }
      }
    }
    this.onBackPressedDispatcher.addCallback(callback)

kotlin获取appllication实例

class MyApp: Application() {

    override fun onCreate() {
        super.onCreate()
        instance = this
    }

    companion object {
        lateinit var instance: MyApp
            private set
    }
}